<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2301-1548</journal-id>
<journal-title><![CDATA[Agrociencia (Uruguay)]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia Uruguay]]></abbrev-journal-title>
<issn>2301-1548</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2301-15482019000200135</article-id>
<article-id pub-id-type="doi">10.31285/agro.23.85</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spatial Distribution and Tree Cover of Hillside and Ravine Forests in Uruguay: the Challenges of Mapping Patchy Ecosystems]]></article-title>
<article-title xml:lang="es"><![CDATA[Distribución espacial y cobertura arbórea del bosque serrano y de quebrada en Uruguay: los desafíos de mapear ecosistemas parchosos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toranza]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lucas]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ceroni]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Ciencias Instituto de Ecología y Ciencias Ambientales]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía Departamento de Producción Forestal y Tecnología de la Madera]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de la República Estación Experimental Dr. Mario A. Cassinoni (EEMAC) ]]></institution>
<addr-line><![CDATA[Paysandú ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de la República CENUR Noreste ]]></institution>
<addr-line><![CDATA[ Rivera]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>23</volume>
<numero>2</numero>
<fpage>135</fpage>
<lpage>146</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482019000200135&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482019000200135&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482019000200135&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: The mapping and monitoring of forest ecosystems on a national scale is key to their management and conservation. Native forests in Uruguay are considered given their importance for biodiversity and ecosystem services. Here we evaluate the spatial distribution of the land cover class &#8216;hillside and ravine forest&#8217; -a subclass of native forest characterized by patches and transition zones with native grasslands- using Landsat images (30 x 30 m) from 2014 and 2015 and high-resolution images from Google Earth. To evaluate spatial heterogeneity within hillside forests, we then used high-resolution spot images of 1 km2 from 1998-2012 to evaluate differences in the normalized difference vegetation index (ndvi) among canopy coverage categories. The hillside and ravine forest class were characterized as a composite cover class with an average canopy coverage of 69 ± 23%, variability of wich was reflected in ndvi values. The total area of this class in 2015 was estimated as 334,480 ha, somewhat less than an earlier 2008 estimate (384,240 ha). Among the potential errors in delineating hillside forests using Landsat images, there was the classification of «forest» in areas characterized by grassland and a tree canopy cover &lt;25 %. This potential error in delimitation at broader scales led to the overestimation of hillside and ravine forest area in southeastern Uruguay, but an underestimation in northern Uruguay. Our study highlights the large discrepancies in the estimation of the distribution of hillside and ravine forest at different spatial scales, and also indicates the potential of ndvi to evaluate the heterogeneity of this forest within the same cover class.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El mapeo y monitoreo de la distribución de los ecosistemas a escala nacional es clave para su manejo y conservación. Los bosques nativos de Uruguay son ecosistemas de interés nacional, de gran importancia para la biodiversidad y servicios ecosistémicos. Aquí evaluamos la distribución espacial del «bosque serrano y de quebrada», una formación parcheada y en transición con los pastizales serranos, utilizando imágenes de Landsat (30x30 m) de 2014 y 2015, e imágenes de alta resolución de Google Earth. Adicionalmente, se utilizaron imágenes spot (1 km2), del período 1998-2012, para evaluar diferencias en el Índice de Vegetación de Diferencia Normalizada (ndvi) entre distintas categorías de densidad arbórea. El bosque serrano y de quebrada se caracterizó por presentar una cobertura media de dosel arbóreo de 69 ± 23 %, cuya variabilidad se reflejó en los valores de ndvi de distintas categorías. La distribución espacial del bosque se estimó en 334.480 ha en 2015, siendo una superficie menor respecto a la cobertura institucional de 2008 (384.240 ha). Se detectaron áreas de pastizal serrano con una cobertura arbórea &lt;25 %, clasificadas como bosque con base en las imágenes Landsat. Esto genera un error en la delimitación del bosque a escala gruesa, con una sobrestimación del área boscosa en el sureste y una subestimación en el norte del país. Este trabajo destaca la discrepancia entre las estimaciones del área total de bosque serrano y de quebrada a distintas escalas espaciales y destaca el potencial del ndvi para evaluar su heterogeneidad interna.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[subtropical forests]]></kwd>
<kwd lng="en"><![CDATA[ndvi]]></kwd>
<kwd lng="en"><![CDATA[canopy]]></kwd>
<kwd lng="en"><![CDATA[southeastern South America]]></kwd>
<kwd lng="en"><![CDATA[Pampean province]]></kwd>
<kwd lng="es"><![CDATA[bosques subtropicales]]></kwd>
<kwd lng="es"><![CDATA[ndvi]]></kwd>
<kwd lng="es"><![CDATA[dosel arbóreo]]></kwd>
<kwd lng="es"><![CDATA[sureste de Sudamérica]]></kwd>
<kwd lng="es"><![CDATA[Provincia Pampeana]]></kwd>
</kwd-group>
</article-meta>
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